"use client";

import { motion } from "framer-motion";
import { signIn } from "next-auth/react";
import { usePathname, useRouter } from "next/navigation";
import { useEffect, useRef, useState } from "react";
import z from "zod";

import { WEBAPP_URL } from "@calcom/lib/constants";
import { useCompatSearchParams } from "@calcom/lib/hooks/useCompatSearchParams";
import { useLocale } from "@calcom/lib/hooks/useLocale";
import { useRouterQuery } from "@calcom/lib/hooks/useRouterQuery";
import classNames from "@calcom/ui/classNames";
import { Button } from "@calcom/ui/components/button";
import { Icon } from "@calcom/ui/components/icon";
import { showToast } from "@calcom/ui/components/toast";

async function sendVerificationLogin(email: string, username: string, t: (key: string) => string) {
  await signIn("email", {
    email: email.toLowerCase(),
    username: username.toLowerCase(),
    redirect: false,
    callbackUrl: WEBAPP_URL || "https://app.cal.com",
  })
    .then(() => {
      showToast(t("verification_email_sent"), "success");
    })
    .catch((err) => {
      showToast(err, "error");
    });
}

function useSendFirstVerificationLogin({
  email,
  username,
}: {
  email: string | undefined;
  username: string | undefined;
}) {
  const sent = useRef(false);
  const { t } = useLocale();
  useEffect(() => {
    if (!email || !username || sent.current) {
      return;
    }
    (async () => {
      await sendVerificationLogin(email, username, t);
      sent.current = true;
    })();
  }, [email, username, t]);
}

const querySchema = z.object({
  email: z.string().optional(),
  username: z.string().optional(),
  paymentStatus: z.string().optional(),
  t: z.string().optional(),
});

const PaymentFailedIcon = () => (
  <div className="rounded-full bg-orange-900 p-3">
    <Icon name="triangle-alert" className="h-6 w-6 shrink-0 p-0.5 font-extralight text-orange-100" />
  </div>
);

const PaymentSuccess = () => (
  <div
    className="rounded-full"
    style={{
      padding: "6px",
      border: "0.6px solid rgba(0, 0, 0, 0.02)",
      background: "rgba(123, 203, 197, 0.10)",
    }}>
    <motion.div
      className="rounded-full"
      style={{
        padding: "6px",
        border: "0.6px solid rgba(0, 0, 0, 0.04)",
        background: "rgba(123, 203, 197, 0.16)",
      }}
      animate={{ scale: [1, 1.1, 1] }} // Define the pulsing animation for the second ring
      transition={{
        duration: 1.5,
        repeat: Infinity,
        repeatType: "reverse",
        delay: 0.2, // Delay the start of animation for the second ring
      }}>
      <motion.div
        className="rounded-full p-3"
        style={{
          border: "1px solid rgba(255, 255, 255, 0.40)",
          background: "linear-gradient(180deg, #66C9CF 0%, #9CCCB2 100%)",
        }}>
        <svg width="24" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
          <path
            d="M2.69185 10.6919L2.9297 10.9297L2.69185 10.6919C1.96938 11.4143 1.96938 12.5857 2.69185 13.3081L7.69185 18.3081C8.41432 19.0306 9.58568 19.0306 10.3081 18.3081L21.3081 7.30815C22.0306 6.58568 22.0306 5.41432 21.3081 4.69185C20.5857 3.96938 19.4143 3.96938 18.6919 4.69185L9 14.3837L5.30815 10.6919C4.58568 9.96938 3.41432 9.96938 2.69185 10.6919Z"
            fill="white"
            stroke="#48BAAE"
            strokeWidth="0.7"
            strokeLinecap="round"
            strokeLinejoin="round"
          />
        </svg>
      </motion.div>
    </motion.div>
  </div>
);

const MailOpenIcon = () => (
  <div className="bg-default rounded-full p-3">
    <Icon name="mail-open" className="text-emphasis h-12 w-12 shrink-0 p-0.5 font-extralight" />
  </div>
);

export default function Verify({ EMAIL_FROM }: { EMAIL_FROM?: string }) {
  const searchParams = useCompatSearchParams();
  const pathname = usePathname();
  const router = useRouter();
  const routerQuery = useRouterQuery();
  const { email, username, paymentStatus } = querySchema.parse(routerQuery);
  const { t } = useLocale();
  const [secondsLeft, setSecondsLeft] = useState(30);

  // Derive payment failed status from payment status
  const hasPaymentFailed = paymentStatus !== undefined && paymentStatus !== "paid";
  const isPremiumUsername = !!paymentStatus; // If paymentStatus exists, it's from premium username flow

  // Only send verification login if we DON'T have the email yet (for resend button)
  // The email is already sent server-side in paymentCallback
  useSendFirstVerificationLogin({
    email: !isPremiumUsername ? email : undefined,
    username: !isPremiumUsername ? username : undefined,
  });
  // @note: check for t=timestamp and apply disabled state and secondsLeft accordingly
  // to avoid refresh to skip waiting 30 seconds to re-send email
  useEffect(() => {
    const lastSent = new Date(parseInt(`${t}`));
    // @note: This double round() looks ugly but it's the only way I came up to get the time difference in seconds
    const difference = Math.round(Math.round(new Date().getTime() - lastSent.getTime()) / 1000);
    if (difference < 30) {
      // If less than 30 seconds, set the seconds left to 30 - difference
      setSecondsLeft(30 - difference);
    } else {
      // else set the seconds left to 0 and disabled false
      setSecondsLeft(0);
    }
  }, [t]);
  // @note: here we make sure each second is decremented if disabled up to 0.
  useEffect(() => {
    if (secondsLeft > 0) {
      const interval = setInterval(() => {
        if (secondsLeft > 0) {
          setSecondsLeft(secondsLeft - 1);
        }
      }, 1000);
      return () => clearInterval(interval);
    }
  }, [secondsLeft]);

  if (!email) {
    return <div>{t("invalid_link")}</div>;
  }

  return (
    <div className="text-default bg-cal-muted/90 backdrop-blur-md backdrop-grayscale backdrop-filter">
      <div className="flex min-h-screen flex-col items-center justify-center px-6">
        <div className="border-subtle bg-default m-10 flex max-w-2xl flex-col items-center rounded-xl border px-8 py-14 text-left">
          {hasPaymentFailed ? (
            <PaymentFailedIcon />
          ) : isPremiumUsername ? (
            <PaymentSuccess />
          ) : (
            <MailOpenIcon />
          )}
          <h3 className="font-cal text-emphasis my-6 text-2xl font-normal leading-none">
            {hasPaymentFailed
              ? t("your_payment_failed")
              : isPremiumUsername
              ? t("payment_successful")
              : t("check_your_inbox")}
          </h3>
          {hasPaymentFailed && <p className="my-6">{t("account_created_premium_not_reserved")}</p>}
          <p className="text-muted dark:text-subtle text-base font-normal">
            {t("email_sent_with_activation_link", { email })}{" "}
            {hasPaymentFailed && t("activate_account_to_purchase_username")}
          </p>
          <div className="mt-7">
            <Button
              color="secondary"
              href={
                EMAIL_FROM
                  ? encodeURIComponent(`https://mail.google.com/mail/u/0/#search/from:${EMAIL_FROM}`)
                  : "https://mail.google.com/mail/u/0/"
              }
              target="_blank"
              EndIcon="external-link">
              {t("open_in_gmail")}
            </Button>
          </div>
        </div>
        <div className="flex items-center gap-2">
          <p className="text-subtle text-base font-normal ">{t("dont_see_email")}</p>
          <button
            className={classNames(
              "font-light",
              secondsLeft > 0 ? "text-muted" : "underline underline-offset-2 hover:font-normal"
            )}
            disabled={secondsLeft > 0}
            onClick={async (e) => {
              if (!email || !username) {
                return;
              }
              e.preventDefault();
              setSecondsLeft(30);
              // Update query params with t:timestamp, shallow: true doesn't re-render the page
              const _searchParams = new URLSearchParams(searchParams?.toString());
              _searchParams.set("t", `${Date.now()}`);
              router.replace(`${pathname}?${_searchParams.toString()}`);
              return await sendVerificationLogin(email, username, t);
            }}>
            {secondsLeft > 0 ? t("resend_in_seconds", { seconds: secondsLeft }) : t("resend")}
          </button>
        </div>
      </div>
    </div>
  );
}
